Injector



Feb-.1, 1944- H. E. F. c. LINGENBRINK 2,340,671

Patented Feb. 1, 1944 UNITED STATES; PATIENT signor to William Sellers & Company, Incorporated, Philadelphia, Ia., a corporation of' Penn- Sylvania Application February 4, 1942, Seriall N10. 429,463`

8 Claims.

This invention relates to an improvement in injectors used for the supplying of feed water to steam boilers.

More particularly, this invention relates to the provision of novel and highly eflicient means for operating the steam and water valves of injectors through the medium of iiuid pressure.

Generally speaking this invention comprehends the provision of fluid pressure actuated means for the control of the 'steam Valve of an injector so arranged that in starting the injector water will be supplied to the mixing tube of the injector before the steam valve is opened.

More particularly, the' fluid pressure actuated means will be soedesigned and arranged that fluid pressure, remotely controlled by a single operating handle, will be used to open the water valve and permit opening of the steam valve. Again, in the closing of the Valves the means will be so arranged that on shutting off the fluid pressure, by manipulation of the operating handle, the steam Valve will close ahead of the water Valve.

Further in accordance with this invention, uid pressure operated means for control of the water and steam valves of the injector are operated subject to a control which, in addition to controlling operation of the two valves, is adapted also for the control of the amount of Water supplied to the injector.

Figure 1 is a cross-sectional View of an injectorv equipped with fluid pressure operated water and steam valves accordingA to thisl invention.

Figure 2 is a fragmentary sectional view of an injector embodying a modification of this inVeni tion.

Figure 3 is a fragmentary View, partly broken away and partly in section, showing a modification in detail of the structure shown in Figure 1.

Figure 4 is a fragmentary View, partly broken away and partly in section, showing another modification in detail of the structure shown in Figure 1.

Figure 5 is a sectionalY View of a regulating Valve showing details of construction.

Referring more particularly to Figure 1, A indicates a casing provided with a water inlet B, a deliveryY outlet C, an overflow outlet D and a steam inlet E.

Within the casing adjacent to the water inlet B is a steam nozzle I adapted to direct water into and through a mixing tube 2, controlled by a water valve 3 and discharging into a water chamber 4. The steam nozzle l is. supplied with steam from the steam inlet E through a pipe 5l under controlofla manually operated regulating valve 6; A main steam nozzle 'lf controlled by a steam valve 8, is adapted to receive steam from the steam inlet E` and to dischargeinto a mixing tube S in communication with the water chamber 4 and withk a forcing tube l0;- arranged in the usual manner for overflow intoy an overflow cham` ber Il. The overow chamber lili communicates with the overow outlet D under control of an overow valve l2. The usual line check' valve (not shown) is pi'ovidedl inconnection with the delivery outlet. C.

The water valve 3',y which in the embodimentshown seats on a seat'forrned:r on the end of the mixing tube' 2, is provided! with a cylindrical extension |35 which extends into a; cylindrical' guide |24', threaded into the casing A,l-and a springv i5 extending. between the' valve and the head' of the guide lili', servestoseat the valvel 3' vvl'l'eri`` the injector is: sluitv down,- and maintainvit seatedwhilethe4 injector is id-le. The guide I=4 is pro-- vided with vent I6: in its head.

The steam valve 81'-, provided with a passage Zit`v for steam from:l the steam-inlet E', seats on-v a seat formed on the end of' theA steam nozzlel and is" provided with a cylindrical extension- IT extending intoa cylinder I8l` formed* in the casing la; threaded into the casing Af The steam valve` ifs*- also. provided with an' upwarizily extendingstem 2id'. The' upper endY of' cyl-indri8 is: closed` by means of a centrally apertured memberl 25|?, the aperturev through which i-sadaptedto be controlled by a Valve Z2?, closed, when! the injector isidle, by a springf23; working between-the valve' and a spring seat 24 supported on a ring 255i The centrally'aperturedf member Z'lfo'rmsan annular space, 2.1` within the' cylinder into which' the extension I7 enters, with a; sliding t, when theJ steam valve is open.

Beyond theV valve? 22` the central aperture' in the member 2l' communicates with atmosphere through a passage 28? in casing I9;

In: the top. of' Casi/ngis; above the valve i'zis formed a cylinder 25, closed'byfathreadedhead Stand containing a piston 315,' which is ccnncated.'v

`to the valve 22:, forits;v operation; through,thenswardly to open valve 22 against its spring 23 through the medium of iins 32.

Until the valve 22 is opened the steam valve 8 remains closed, due to the pressure on its upper Y side from steam passing from the steam inlet through the passage 26. When, however, the valve 22 is opened, pressure escapes from the upper side of the valve 8 to atmosphere through the opening 28, and the valve is then opened by steam pressure from the steam inlet E on its under side.

Asthe steam valve 8 opens the extension I1 enters Athe annular space 21 and the stem 20 enters the aperture in the spring seat 24, in which it has a sliding lit. The opening movement of the valve 8 is cushioned by the fact thatl pressure above the valve in its opening movement can escape only around the stem 20.

As will be obvious, when the steam valve 8 is open steam from the steam inlet E passes through the steam nozzle 1 into the mixing and `combining tubes 9, I0, while water enters the combining tube 9 through the water chamber 4.

As will be observed,the water valve inevitably opens before the steam valve opens, inasmuch as the opening of the steam valve is dependent upon the development of pressure in water chamber 4, which is developed only after the water valve is opened. Conversely, the steam valve will close ahead of the water valve inasmuch as the spring 23, which operates to close valve 22, is of a strength such that it will eiiect the closing of valve 22, with resultant building up of pressure on the upper side of the valve 8 and its closing, on a predetermined drop in pressure in the Water chamber 4. The same result can be obtained b y suitably proportioning the areas of piston 3l and valve 22.

In the operation of the injector the amount of water can be accurately controlled through manipulation of the regulating valve 6, it being noted that the regulating valve 6 controls the steam passing through the steam nozzle I, which in turn controls the amount of water discharged into the chamber 4.

At the same time, if the regulating valve be positioned so that insuiiicient water is supplied for operation of the injector, the pressure in chamber 4 will drop and consequently the pressure on the piston 3| will drop to a point at which the valve 22 will close under the influence of its spring 23, with consequent closing of the steam valve. Hence, while the valve 6 can be used in the operation of the injector for regulation of the water supply, if too little water be supplied the injector will shut down by closure of the steam valve.

, Referring now to Figure 2 in which elements similar to those in the structure shown in Figure 1 are indicated by similar reference characters, a

water inlet F is provided for the supply of water to an` annular inlet chamber 35 arranged within the casing above the mixing tube 9. The :flowA of water to the chamber 35 is controlled by a arranged about the steam nozzle 1 for discharge into the mixing tube 9. The primary steam nozzle 31 extends into chamber 35 and its discharge end is spaced from the upper end of the mixing tube 9 and steam is supplied to the nozzle from the steam inlet E through a pipe 38, leading to a steam chamber 39 and controlled by a manually operated control valve 10.

Below the top of the mixing tube 9 and slightly above the discharge end of the steam nozzle 1, an annular laterally extending passage 40 is formed in the wall of the mixing tube immediately below which the bore of the mixing tube is restricted to form a ledge or baille 4 I. The annular passage 40 communicates with an annular chamber 42 which is connected by a pipe 43 to the upper end of cylinder 29 of the steam Valve (8) control mechanism. The upper portion 9' of the mixing tube 9 above the passage 4U forms a primary mixing tube.

The operation of the modification of this invention as described in connection with Figure 2 willbe, it is believed, substantially obvious. However, assuming the injector to be shut off with the' steam valve 8 and water valve 33 closed, and it being desired to start the injector, the valve 10 will be opened, admitting steam to the chamber 39 and the primary steam nozzle 31, from which it will be discharged into the mixing tube 9. The discharge of steam from the primary steam nozzle 31 will cause a vacuum in chamber 35, which will operate to causethe water valve 36 to'be opened with,v as a result, a supply of water to chamber 35 and to the mixing tube 9. The water will, under the influence of steam discharged from the primary steam nozzle 31, at tain high velocity in the mixing tube.- A small portion of the water passing through the mixing tube will,-on meeting the'bailie or ledge 4I. be

diverted into annular passage 40, from which it` will pass into chamber 42 and through pipe 43 to cylinder 29. The velocity of the water will be converted to pressureV in passage 40, which will act on the piston 3l to open the valve 22 with resultant opening of the steam valve 8, as in the case of the structure heretofore described with reference to Figure 1.

Referring now to Figure 3, the water valve 3 isr provided with a .stem 44, which extends` through a guide 45 formed onV the top of the guide I4; andV operative connection between the sternr valve 3 is provided with passages or iiutes 50 to afford communication between chamber 4 and the interior of guide I4. Y Y

The cylinder 48 is open at its top andcontains a piston 5I, the upper end of which isvoperatively connectedto the varies 32v of valve 22,. of the steam valve control mechanism, through the rocker 46 pivoted to a bracket 41'. t Y 4 Theoperation of the modiiications of the structure Vshown in Figures 3 and 4 will, it is be lieved, be obvious. However, in the modiiication shownY in Figure 3, when the water valve 3 opens under rthe iniiuence of pressure in the mixing tube 2, the stem 44 of the valve3 will operate. through V'the-rocker 46 toppen thevalve 22 with;

consequent openingzo'f vthesteam valve 8 ashere- `tofre described with lreference to 'Figure 1.

In fthemodication shown in Figure 4, when the V.water valve 3 .opens a'iluid pressure'is developed 'in chamber 12. Fluidpressure from the chamber will :pass through passage `I9 and Yraise piston .'5I, which will eiect opening of the valve .22 ithrough the medium Vof rocker 146. Opening ofthe valve 22 will, as in the case `of the structure heretofore described with reference to Figure 1, resultl in opening of the steam valve 8.

Referring now to Figure 5, the control valve shown may be used in place of valve 6, Figure 1, or in place of valve 10, Figure 2. The valve comprises a casing 60, provided with threaded nipples 6I, 6| for connection into a 4pipe line, within which is formed a valve seat 62 on which is adapted to seat a valve 63 adapted to control the ow of uid in the direction of the arrow. The valve 63 is provided with guide ns 64 and is adapted to be opened by means of a manually operated cam 65 through the medium of a pivoted lever 66 upon which the cam acts and which, under the influence of the cam, bears on the end of the guide fins 64 on the valve. Ahead of the valve 63 is a butterfly valve 6'l, adapted to be manually controlled. A bypass 68, with respect to valve 63, is controlled by a manually operated needle valve 69.

In operation of the control feature shown in Figure 5, the valve 63 will be opened by manipulation of the cam 65, and flow through the valve will be controlled by adjustment of the valve 6l. Under many circumstances the butterfly valve will be set and the valve 63 thrown wide open when it is desired to start the injector. The needle valve 69 will be adjusted to permit heated fluid, as steam, to bypass the valve 63 in regulated quantity to keep the pipe line from freezing.

It will be understood that it is not intended that this invention shall be limited by the above description and accompanying drawings, since it will be appreciated that various modification in detail may be made therein Without departing from the scope of the claims appended hereto. It is further not intended that this application shall be limited to any particular type of injector, since it will be appreciated that it is applicable to injectors of various types having water and steam valves.

What I claim and desire to protect by Letters Patent is:

1. In an injector, in combination, a casing, a water chamber in the casing, a primary steam nozzle, a mixing tube having an inlet for water from said water chamber and adapted to receive steam from the primary steam nozzle, a main steam nozzle arranged to discharge into said mixing tube, means for the supply of steam to the primary and main steam nozzles, a valve for the control of the main steam nozzle and means for the control of said valve for the control of said main steam nozzle adapted to be actuated under iiuid pressure derived from the mixing tube.

2. In an injector, in combination, a mixing tube, means including a steam nozzle for the discharge of Water under pressure to said mixing tube, a main steam nozzle arranged to discharge into the mixing tube, a conduit for the supply of steam to said steam nozzles, a Valve for the control of the main steam nozzle, and means for the control of said valve actuated by fluid pressure derived from said means for the discharge of Water into said mixing tube,

f f3. Iman-injector,- -in combination, a casing, a chamberfwit-hin -the'casing, means including a steam nozzle 'for the discharge -of water 4under pressure into the chamber, a mixingtube larranged to receive water from the chamber, a main steam nozzle arranged to discharge into thermix- -ifng tube, a conduit for the supply of steam to saidmain steam nozzle, ka valverfor thefcontrol of Athemain steam nozzle, and-means for the control of said valve actuated by uid pressure derived from said means for the discharge of water into said chamber.

4. In an injector, in combination, acasing, a chamber within the. casing, means including a, steam nozzle for the discharge of water under pressure into the chamber, a mixing tube arranged to receive water from the chamber, a main steam nozzle arranged to discharge into the mixing tube, a conduit for the supply of steam to said main steam nozzle, a valve for the control of the main steam nozzle, fluid actuated means for the control of said valve, and a conduit affording communication for fluid pressure between said chamber and said fluid actuated means for the control of said valve.

5 In an injector, in combination, a chamber, means for the discharge of water under pressure into the chamber, means for controlling this Water pressure, a mixing tube communicating with the chamber, a steam nozzle arranged to discharge into the mixing tube, a conduit for the supply of steam to said steam nozzle, a valve for the control of said steam nozzle, fluid actuated means for the control of said valve arranged such as to cause closing of said valve When said water pressure in said chamber has reached a predetermined minimum and to cause opening of said valve when said water pressure in said chamber has reached a predetermined maximum.

6. In an injector, in combination, a casing, a water chamber in the casing, means including a mixing tube and a steam nozzle for the supply of water to said chamber under pressure, a spring pressed valve controlling the discharge from said steam nozzle, fluid actuated means for the con--l trol of said last mentioned valve and a conduit affording communication between said chamber and said fluid actuated means for the control of said last mentioned valve.

"7. In an injector, in combination, a water inlet, a steam nozzle and mixing tube adjacent said water inlet, a Water valve for controlling discharge from said mixing tube, a chamber for receiving discharge from said mixing tube, a main steam nozzle and a main mixing tube adapted to receive water from said chamber, a normally closed valve for controlling the admission of steam to Said second steam nozzle, fluid pressure actuated means for controlling the opening of said valve for controlling the admission of steam to said second steam nozzle, means for controlling the admission of steam to said rst mentioned steam nozzle and means affording communication for fluid pressure between said chamber and said means for controlling the opening of said valve for controlling the admission of steam tov said second steam nozzle,

8. In an injector, in combination, a primary mixing tube, an inlet for Water to. said tube, a-

primary steam nozzle discharging into said tube,

4 aumen ,a .chamber arranged to receive discharge from said tube, a spring loaded valve controlling dise charge from said tube, a main mixing tube arranged to receive Water fromsaid chamber,ia

main steam nozzle arranged to dischargeinto said main mixing tube, a conduit for steamA communicating with said main steam nozzle, a .valve controlling said main steam nozzle, uid pressure actuated means for controlling the opening of said last mentioned valve, a. conduit for the 

